Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d7af01a954a39c…

MALICIOUS

PDF

74.1 KB Created: 2021-04-02 05:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55413e3186b3db900401087b9576bc21 SHA-1: 847aa1c256ce5816158211a2613545e1dc80f646 SHA-256: f8d7af01a954a39cab514ce4dbe0b3be35ff912c80c39bca463af6e9a22d69f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are SEO-themed, suggesting a link farm or phishing lure. One prominent URL, https://botokaw.ru/wix?keyword=liftmaster+garage+door+keypad+programming, is likely a phishing destination. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan payload. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://botokaw.ru/wix?keyword=liftmaster+garage+door+keypad+programming
    • https://cdn-cms.f-static.net/uploads/4366009/normal_603a0a4a864c4.pdf
    • https://cdn-cms.f-static.net/uploads/4415518/normal_601448672ec8e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gagagakigibapo/asus_laptop_drivers_for_windows_8._1.pdf
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_83aedfd2c23f4446b3e14e98c179b380.pdf?index=true
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_affe7cff0730474ea3a8f8b09c206be2.pdf?index=true
    • https://s3.amazonaws.com/kujapomib/budelovivimiragaj.pdf
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_32292c1488e94050960ab13132218606.pdf?index=true
    • https://66166ed5-207d-48ad-a5ac-83b7e977862f.filesusr.com/ugd/0d0d42_dd8f1ca10dae4e319beae6cbf784e7f2.pdf?index=true
    • https://s3.amazonaws.com/tojazudibumogab/xibobewanak.pdf
    • https://s3.amazonaws.com/muvojugejoxip/84072342354.pdf
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_5e6257d14e2a4f098806e85ff991cf96.pdf?index=true
    • https://s3.amazonaws.com/tonemakopinibem/my_talking_angela_2_apkpure.pdf
    • https://8f1ef4f7-3f23-41ef-a3d6-4e5873a175a2.filesusr.com/ugd/d318ce_394748981ced4077aea45d228bf0bbb0.pdf?index=true
    • https://s3.amazonaws.com/tidigudetefumof/pre_appraisal_form_answers.pdf
    • https://s3.amazonaws.com/kabisebax/47159692034.pdf
    • https://s3.amazonaws.com/gogonof/ios._appchina._com_app_link.pdf
    • https://s3.amazonaws.com/sinamozagemoger/non_degenerate_bilinear_form.pdf
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_e6757373a09648fdbf9c96ebdaa0c50f.pdf?index=true
    • https://s3.amazonaws.com/vobuturinivi/52982620640.pdf
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_a49853ca14404e1aabef88881b420a00.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e361.bin
0aea14b7dac8cc531ab27c7baf94fc1c160850e777569c6483f5d24bf795660e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE361 5436 bytes
font_01_sfnt_off0000f5de.bin
6cec16a7390c6d8dfab5579e76f975448d4699daa51f003586319273ff613283		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DE 10928 bytes

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